How Do I Troubleshoot the Impeller For the Fluval 304?

The Fluval 304 is an external canister filtration system for home aquariums. The 04 series of Fluval filters features a transparent cover so you can see when the impeller needs maintenance. An impeller is the motorized part of the Fluval 304 that moves the water in the tank over the filter media within the canister. If the impeller becomes clogged with debris, it will not function efficiently. Cleaning and assembling the impeller correctly should solve most problems unless the impeller is broken.

Things You'll Need

  • Retrieval tool (supplied with your Fluval 304)
  • Soft-bristled brush (Optional)
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Instructions

    • 1

      Unplug the Fluval 304 from the electrical outlet.

    • 2

      Pinch the two tabs on the impeller cover to open the impeller well. The impeller cover is located on the underside of the lid of the filtration unit. This exposes the impeller fan.

    • 3

      Pull the impeller fan and impeller from the impeller well.

    • 4

      Insert the hooked end of the retrieval tool -- also called the ceramic shaft tool -- that came with your Fluval 304 into the hole in the center of the impeller well. Hook the tool onto the ceramic shaft assembly and pull it out gently. Pull up as straight as possible.

    • 5

      Rinse all the parts you removed in clean water. If any debris won't come off, use a soft-bristled brush to carefully scrub away any grime.

    • 6

      Inspect all parts for damage or wear. If any piece appears broken, bent or worn, order new parts through your local Fluval dealer.

    • 7

      Reassemble the impeller. Reinsert the ceramic shaft assembly into the hole in the center of the impeller well. Replace the impeller and impeller fan with the shaft of the impeller inserted into the cover's support ring. Place the cover back onto the impeller well and turn it until you hear a "click." Replace the lid onto the canister and plug the filter back into the outlet.